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Word Count: 1,155
Some thirty years ago the RAND Corporation Americas foremost Cold War think-tank faced a strange strategic problem How could the US authorities successfully communicate after a nuclear war Post-nuclear America would need a command-and-control network linked from city to city state to state base to base However no matter how thoroughly that network was armored or protected its switches and wiring would always be vulnerable to the impact of atomic bombs A nuclear attack would destroy any conceivable network How would the network itself be commanded and controlled Any central authority any network central citadel would be an obvious and immediate target for an enemy missile The center of the network would be the very first place to be destroyed RAND mulled over this grim puzzle in deep military secrecy and arrived at a daring solution The RAND proposal was made public in 1964 In the first place the network would have no central authority Furthermore it would be designed from the beginning to operate while in tatters The principles were simple The network itself would be assumed to be unreliable at all times It would be designed from the beginning to transcend its own unreliability All the nodes in the network would be equal in status to all other nodes each node with its own authority to originate pass and receive messages The messages themselves would be divided into packets each packet separately addressed Each packet would begin at some specified source node and end at some other specified destination node Each packet would wind its way through the network on an individual basis The particular route that the packet took would be unimportant only final results would count Basically the packet would be passed from node to node to node more or less in the direction of its destination until it ended up in the proper place If large portions of the network had been destroyed it simply wouldnt matter the packets
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